POU2F3 and gastric cancer: Given that 18:0- and 18:1-containing PS may be the main fatty acids in gastric cancer cells infiltrating the peritoneum, PS-PLA1 and/or unidentified novel phospholipase A2, which deacetylates the sn-2 position of PS, might be involved in the formation of 18:0 or 18:1 LysoPS.